[Tom Goldman]

When I switched from an old low volume Moroso pump to a Meziere 50 gpm pump ,I found reducing the restrictor from 3/4" to 1/2" was what the system wanted....Take a look at the actual area of an open thermostat, it isn't very much!
You definatly want to make sure the coolant stays in the radiator long enough.
Also a hi volume pump need an equally good cooling fan to go with it .
A good shroud and a fan with at least 1500cfm is worth a lot of cooling.